how to differentiate new style with old style

Question

i need to create Style1 style in the word document, before
adding the style i should check whether the style is already exist.

i can check that Style1 is already exist but the document
already contain Style1 style means i need to check the style(Style1) is already created or
created by me.

Note: If the document doesn't contain Style1 style means, il
create the Style1 style, again im going to apply the Style1 style in another place
means how can i differentiate Style1 is created by me or created by someone before the same style Name.